AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

TB 9-2320-279-13-1

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to AC system OK.

Visual inspection.

page 0015-9.

AC heater/evaporator blower OK.

REASON FOR QUESTION

AC control circuits OK (except for

temperature control and low pressure

Does AC condenser dryer

If system is not fully charged,

switches).

system may not cool

sight glass indicate system is

AC low pressure switch OK.

properly.

fully charged?

No AC condenser dryer desiccant

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

contaminant in AC refrigerant system.

No AC refrigerant oil contaminant in AC

refrigerant system.

POSSIBLE PROBLEMS

Perform leak test

Restricted AC hose.

(WP 0049). If leaks

AC compressor faulty.

are found, recover

Temperature control switch faulty.

R-134a refrigerant

Moisture in AC refrigerant system.

(WP 0050), repair

leaks, and replace

Air or other contaminant in AC refrigerant

YES

AC dryer (WP 0025).

system.

Charge system to full

AC condenser core faulty.

charge (WP 0050)

AC expansion valve faulty.

and go to Step 5 of

AC system overcharged.

this fault.

AC condenser dryer faulty.

AC evaporator core faulty.

AC system charge low.

AC system leaking.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

0015-8